CONCAVE GRATINGS FOR CONSTANT-DEVIATION MONOCHROMATORS
Concave gratings differ from plane gratings in that they have the advantage of setting up a spectroscopic system without any imaging optics like concave mirrors. For this reason, the concave grating is used in a wide range of applications, such as analytical instruments, optical communications, biotechnology, and medical instruments.
We offer a configuration that combines a concave grating for Monochromators, a cabinet, and a diffraction grating drive mechanism. If you are interested, please also see the following page on miniature spectrometers.
Miniature spectrometer (Monochromator) – SPG-120 Series
Examples of end-product applications
- Microplate Reader
- Spectroscopy Monochrome Light Source
- Film Thickness Measurement
Standard Product List
Individual optical configurations can be viewed by clicking on each product in the table below.
- * The nominal braze wavelength is the approximate wavelength of the maximum diffraction efficiency at the design mount. It does not guarantee the wavelength of maximum diffraction efficiency.
It is brazed by the ion beam etching method.
Concave BHG Mounting for Constant-Deviation Monochromator
Standard Specifications
| Grating Type | Unequally spaced curved-groove replica grating*1 |
|---|---|
| Blank Material | Soda glass |
| Dimensional tolerances Width (W) and height (H) of rectangular blanks Diameter (Φ) of round blanks Thickness (T) |
±0.2mm 0/−0.2mm ±0.5mm |
| Effective Area | Total area less a 2mm strip around the perimeter |
| Groove Density Tolerance (at center of grating) | ±2 grooves/mm |
| Doating (vacuum evaporation) | Aluminum (Aℓ) |
| Scratches and digs | 80-50 (in accordance with MIL-O-13830A) |
- *1 The grating grooves are formed with resin.
- * Supports RoHS compliant (10 substances)
- * Be sure to prevent condensation as this can cause a significant deterioration of optical characteristics.
- * In the interests of product improvement, the external appearance and specifications are subject to change without notice.
Appearance
Shape of Concave Gratings
Special Specifications
When you need special concave gratings other than our standard, please contact us.
Holographic gratings (HG) are also available.